采矿与安全工程学报2018，Vol.35Issue(1)：1-9,9.DOI:10.13545/j.cnki.jmse.2018.01.001
深井沿空留巷底鼓演化机理模型试验研究
Model test on evolution mechanism of floor heave in gob-side retaining entry of deep mine
摘要
Abstract
In order to investigate characteristics and evolution mechanism of floor heave in gob-side retaining entry of deep mine, the model test for evolution mechanism of floor heave in gob-side retain-ing entry of deep mine under typical conditions has been carried out. Taking the deep gob-side retaining entry of Guqiao coal mine in Huainan mine field as the engineering background, the test adopts self-developed multi-functional simulation test apparatus with biaxial four-side adjustable loading. The model test results show that: 1) The floor heave of the gob-side entry retaining was serious starting from the initial development to the abandoned stage. The floor heave was occurred in the development stage, but it mainly occurs in the first mining to the second mining stages. 2) The deep rock mass of roadway floor is mainly compressive strain, the shallow rock mass presents the "tension- compression" strain transition phenomenon and the interface of "tension-compression" strain moves to the deeper inside. 3)the compression bending type, the shear dislocation type and the extrusion fluidity type, which causes the tensile failure or tensile shear failure with large deformations and asymmetrical characteristics. 4) according to the emergence and development of floor heave, the evolution process of floor heave is di-vided into five periods which include the slip-bending line formation stage, the shear dislocation failure stage, the shear fracture stage, the extrusion fluidity stage and the abscission layer stage. The prevention and control of floor heave in gob-side retaining entry could be included in the whole control system of roadway surrounding rock, which was put forward based on analyses of deformation characteristics and the evolution mechanism of floor heave. The various prevention and control countermeasures are given out according to different stages, which provides guidance for gob-side entry retaining in deep mine.关键词
沿空留巷/深部矿井/底鼓/演化机理/模型试验/防控对策Key words
gob-side entry retaining/deep mine/floor heave/evolution mechanism/model test/prevention-control countermeasures分类
矿业与冶金引用本文复制引用
华心祝,杨明,刘钦节,杨朋..深井沿空留巷底鼓演化机理模型试验研究[J].采矿与安全工程学报,2018,35(1):1-9,9.基金项目
国家自然科学基金项目(51274010) （51274010）
